ISDN uses _____ technology.
Answer: A
Correct answer: only digital
ISDN is digital end to end: the signal is digital on the subscriber's line as well as in the exchange, which is what removes the need for a modem and gives it its quick call setup.
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Which is LEAST likely to interfere with upgrading to a newer DOS version?
Answer: B
Correct answer: Video controller
A DOS upgrade touches the BIOS interface, the disk structures and the existing files, so all three of those can obstruct it. The video controller is addressed the same way by every version, so it is the least likely to interfere.
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A laser printer generates a totally black page, what is the cause?
Answer: D
Correct answer: no power to the primary corona
The primary corona lays the uniform negative charge that the laser then discharges selectively. Without it the drum is uncharged everywhere, so toner is attracted over the whole surface and the page comes out black.
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You must service the laser printer in your office. Which part of the printer shoud you avoid touching because it is hot?
Answer: A
Correct answer: fuser
The fuser melts the toner into the paper, so it runs at around 200°C and stays hot for some time after the printer is switched off. It is the one part that will burn the hand.
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The acronym HDI stands for:
Answer: D
Correct answer: Head to disk interference
HDI is head-to-disk interference - contact between the flying head and the platter, which is what a head crash consists of. The heads normally fly a fraction of a micron clear.
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You are testing the resistance in Ohms of a fuse on a 5 amp system. If the fuse is good, the meter should read?
Answer: C
Correct answer: 0.0
A good fuse is a piece of wire, so its resistance is effectively zero and the meter reads 0.0. Its current rating has no bearing on the resistance reading.
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During the normal PC boot process, which of the following is active first?
Answer: C
Correct answer: ROM BIOS
At power-up nothing has been loaded from disk, so the first code executed must already be in firmware. The ROM BIOS then reads CMOS for the settings and goes on to the disk.
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When configuring a new network interface card for installation, which of the following would be a valid I/O address?
Answer: D
Correct answer: 360
378 is the parallel port, 2F8 and 3F8 are serial ports, so all three are already taken by standard devices. 360 is in the range left free for network cards.
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Which device should not be plugged into a standard ups?
Answer: B
Correct answer: laser printer
A laser printer's fuser draws a very large current each time it heats, far beyond what a standard UPS is built to supply, and can trip or damage it. Printers are put on the surge-protected outlets instead.
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What is the main communication method from one PDA to another PDA?
Answer: A
Correct answer: IR
Handheld organisers exchanged data by lining up their infrared ports, which needed no cable and no configuration. USB and FireWire connect a PDA to a computer rather than to another PDA.
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